import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth'
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/login'] // no redirect whitelist

router.beforeEach(async(to, from, next) => {
  // start progress bar
  NProgress.start()

  // Vue.ls.get

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()
  const hasRefreshToken = getToken(true)

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done()
    } else {
      // determine whether the user has obtained his permission through getPermissions
      const hasPermissions = store.getters.permissions && store.getters.permissions.length > 0
      if (hasPermissions) {
        next()
      } else {
        try {
          // 没有权限，从后台获取用户的权限
          const { permissions } = await store.dispatch('user/getPermissions')

          // 根据后台传入的permissions生成可访问的路由
          const accessRoutes = await store.dispatch('permission/generateRoutes', permissions)

          // dynamically add accessible routes
          router.addRoutes(accessRoutes)

          // hack method to ensure that addRoutes is complete
          // set the replace: true, so the navigation will not leave a history record
          next({ ...to, replace: true })
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/
    // 没有token 先判断是否存在refreshToken

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      if (hasRefreshToken) {
        try {
          // 根据refreshToken获取accessToken
          await store.dispatch('user/refreshToken')
          next({ ...to, replace: true })
        } catch (error) {
          // refreshToken无效或者失效
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      } else {
        // 没有refreshToken，直接跳转
        next(`/login?redirect=${to.path}`)
        NProgress.done()
      }
    }
  }
})

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})
